e2fs.h revision 720fc26d33352407715cb286a4edc23d15906d5f 
1/* vi: set ts=4:
2 *
3 * mke2fs.h - Headers for ext2
4 *
5 * Copyright 2006 Rob Landley <rob@landley.net>
6 */
7
8// Stuff defined in linux/ext2_fs.h
9
10#define EXT2_SUPER_MAGIC  0xEF53
11
12struct ext2_superblock {
13	uint32_t inodes_count;      // Inodes count
14	uint32_t blocks_count;      // Blocks count
15	uint32_t r_blocks_count;    // Reserved blocks count
16	uint32_t free_blocks_count; // Free blocks count
17	uint32_t free_inodes_count; // Free inodes count
18	uint32_t first_data_block;  // First Data Block
19	uint32_t log_block_size;    // Block size
20	uint32_t log_frag_size;     // Fragment size
21	uint32_t blocks_per_group;  // Blocks per group
22	uint32_t frags_per_group;   // Fragments per group
23	uint32_t inodes_per_group;  // Inodes per group
24	uint32_t mtime;             // Mount time
25	uint32_t wtime;             // Write time
26	uint16_t mnt_count;         // Mount count
27	uint16_t max_mnt_count;     // Maximal mount count
28	uint16_t magic;             // Magic signature
29	uint16_t state;             // File system state
30	uint16_t errors;            // Behaviour when detecting errors
31	uint16_t minor_rev_level;   // minor revision level
32	uint32_t lastcheck;         // time of last check
33	uint32_t checkinterval;     // max. time between checks
34	uint32_t creator_os;        // OS
35	uint32_t rev_level;         // Revision level
36	uint16_t def_resuid;        // Default uid for reserved blocks
37	uint16_t def_resgid;        // Default gid for reserved blocks
38	uint32_t first_ino;         // First non-reserved inode
39	uint16_t inode_size;        // size of inode structure
40	uint16_t block_group_nr;    // block group # of this superblock
41	uint32_t feature_compat;    // compatible feature set
42	uint32_t feature_incompat;  // incompatible feature set
43	uint32_t feature_ro_compat; // readonly-compatible feature set
44	char     uuid[16];          // 128-bit uuid for volume
45	char     volume_name[16];   // volume name
46	char     last_mounted[64];  // directory where last mounted
47	uint32_t alg_usage_bitmap;  // For compression
48	// For EXT2_COMPAT_PREALLOC
49	uint8_t  prealloc_blocks;   // Nr of blocks to try to preallocate
50	uint8_t  prealloc_dir_blocks; //Nr to preallocate for dirs
51	uint16_t padding1;
52	// For EXT3_FEATURE_COMPAT_HAS_JOURNAL
53	uint8_t  journal_uuid[16];   // uuid of journal superblock
54	uint32_t journal_inum;       // inode number of journal file
55	uint32_t journal_dev;        // device number of journal file
56	uint32_t last_orphan;        // start of list of inodes to delete
57	uint32_t hash_seed[4];       // HTREE hash seed
58	uint8_t  def_hash_version;   // Default hash version to use
59	uint8_t  padding2[3];
60	uint32_t default_mount_opts;
61 	uint32_t first_meta_bg;      // First metablock block group
62	uint32_t mkfs_time;          // Creation timestamp
63	uint32_t jnl_blocks[17];     // Backup of journal inode
64	// uint32_t reserved[172];      // Padding to the end of the block
65};
66
67struct ext2_group
68{
69	uint32_t block_bitmap;       // Block number of block bitmap
70	uint32_t inode_bitmap;       // Block number of inode bitmap
71	uint32_t inode_table;        // Block number of inode table
72	uint16_t free_blocks_count;  // How many free blocks in this group?
73	uint16_t free_inodes_count;  // How many free inodes in this group?
74	uint16_t used_dirs_count;    // How many directories?
75	uint16_t reserved[7];        // pad to 32 bytes
76};
77
78struct ext2_dentry {
79	uint32_t inode;         // Inode number
80    uint16_t rec_len;       // Directory entry length
81    uint8_t  name_len;      // Name length
82    uint8_t  file_type;
83	char     name[0];     // File name
84};
85
86struct ext2_inode {
87	uint16_t mode;        // File mode
88	uint16_t uid;         // Low 16 bits of Owner Uid
89	uint32_t size;        // Size in bytes
90	uint32_t atime;       // Access time
91	uint32_t ctime;       // Creation time
92	uint32_t mtime;       // Modification time
93	uint32_t dtime;       // Deletion Time
94	uint16_t gid;         // Low 16 bits of Group Id
95	uint16_t links_count; // Links count
96	uint32_t blocks;      // Blocks count
97	uint32_t flags;       // File flags
98	uint32_t reserved1;
99	uint32_t block[15];   // Pointers to blocks
100	uint32_t generation;  // File version (for NFS)
101	uint32_t file_acl;    // File ACL
102	uint32_t dir_acl;     // Directory ACL
103	uint32_t faddr;       // Fragment address
104	uint8_t  frag;        // Fragment number
105	uint8_t  fsize;       // Fragment size
106	uint16_t pad1;
107	uint16_t uid_high;    // High bits of uid
108	uint16_t gid_high;    // High bits of gid
109	uint32_t reserved2;
110};
111
112#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001
113#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002
114#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004
115#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008
116#define EXT2_FEATURE_COMPAT_RESIZE_INO		0x0010
117#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
118
119#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
120#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
121#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
122
123#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
124#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
125#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004
126#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008
127#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
128
129#define EXT2_NAME_LEN 255
130
131// Ext2 directory file types.  Only the low 3 bits are used.  The
132// other bits are reserved for now.
133
134enum {
135	EXT2_FT_UNKNOWN,
136	EXT2_FT_REG_FILE,
137	EXT2_FT_DIR,
138	EXT2_FT_CHRDEV,
139	EXT2_FT_BLKDEV,
140	EXT2_FT_FIFO,
141	EXT2_FT_SOCK,
142	EXT2_FT_SYMLINK,
143	EXT2_FT_MAX
144};
145